Researchers found dissolved methane in water pumped from 82 percent of drinking water wells sampled in northeastern Pennsylvania.

from grist

"While the EPA has been dumping and delaying studies of fracking’s effects on drinking water, new academic research reveals that people who live near natural gas wells in Pennsylvania are drinking the same gases that the frackers are pumping out from the shale beneath their feet.

"Researchers from Duke University, the University of Rochester, and California State Polytechnic University found dissolved methane, which is the main ingredient in natural gas, in water pumped from 82 percent of drinking water wells sampled in northeastern Pennsylvania.

"Methane can occur naturally in the area (that’s what draws frackers there). But the researchers’ study, published in Proceedings of the National Academy of Sciences, concludes that levels of the gas were far higher in drinking water wells located close to fracking operations than in other areas. …"